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Sh2-223 Region



Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA, 30 November and 4 December 2021,  Camera: ASI1600MM (Astronomik Gen 2  Ha OIII RGB Filters)

Exposure: Exposure: Ha - 64 x 7 min (gain-300 2x2), OIII - 36 x 7 min (gain-300 2x2) ,  RGB -20 x 3 min (gain-120 2x2) each RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration, Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight (WBPP).  Mure Denoise - PixInsight. Non-linear stretching, normalization and gradient removal - PixInsight.  Generation of starless nebulosity Ha and OIII images for later processing - Star XTerminator. Curves, Levels, stars RGB combine, stars Luminance layering - PixInsight. Color Stars and Starless  combine - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  Bicolor narrow band image (modified HOO) with RGB stars.  Image processed at 4144x2822 resolution. Final Image size is approximately  4000x3013.

North is up in this image.  This image shows the emission nebula (HII region) Sh2-223 (also known as LBN 768).  Sh2-223 is the brighter portion of nebulosity in this image. The larger circular structure that is associated with Sh2-223 was thought to be a supermova remnant (SNR G166.2+02.5). It was listed in Green's supernova remnant catalog (which he has had several revisions during the past two decades). Between the 2001 and 2009 versions this supernova was dropped from Green's catalog - published work by Foster et. al. showed that this larger structure is only a HII region. This field also shows two open clusters  - SAI 47 (aka MWSC 526) and COIN-Gaia 12.  These objects and some of the brighter stars are identified in the annotated imageHorizontal FOV is approximately 115 arc minutes. Full size image scale is 1.73 arcsec/pix.

Image center is approximately - Equatorial 2000: RA: 05h 19m 04s Dec: +4151'56"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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